Abstract
Integrated thermal treatment (coupled pyrolysis and combustion) is considered to be an effective method for the utilization of oil sludge (OS). Characteristics of OS pyrolysis, OS combustion and OS char combustion were comprehensively investigated with a thermogravimetry-mass spectrum (TG-MS) system in this work. Small molecule hydrocarbons like CH4 were main components in OS pyrolysis gas. Nitrogen and sulfur containing compounds, H2O, and CO2 were detected out during OS and OS char combustion. The maximum intensities of NH3, HCN and NO all appeared in the OS combustion. H2S was the main precursor of SO2, and the peak of H2S occurred earlier with an increase in the pyrolysis temperature between 500 and 700 °C. Besides, with an increase in the pyrolysis temperature, NO2 and SO2 emissions increased during OS char combustion.
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